Proper measuring is key when building turbochargers. The tolarences involved are crutial to a properly operating turbocharger. The main components of a turbocharger are the "Compressor Wheel" and the "Turbine Wheel/Shaft". When ordering turbo components you may be asked "What are your Inducer and Exducer measurements?" Below you will find diagrams and directions explaining the procedure.Use a set of calipers to measure. Typically units for these measurements are in millimeters. If you use "Inches" just multiply by 25.4 to convert to millimeters.

When measuring the wheel, insert the area to be measured inside the calipers and rotate the wheel to get a true measurement.

Here is a typical diagram showing a section of a compressor wheel (side view).

"A" Dimension - Inducer Diameter

"B" Dimension - Tip Height

"C" Dimension - Exducer Diameter

"D" Dimension - Hub Length

Below is a typical diagram showing a section of a Turbine Wheel/Shaft (side view).